High-power density lithium ion battery

The invention provides a high-power density lithium ion battery, and belongs to the technical field of lithium ion batteries. The lithium ion battery comprises a positive pole piece and a negative pole piece; the positive pole piece comprises an aluminium foil, a positive pole electricity conducting agent and a positive pole adhesive; the negative pole piece comprises a copper foil and a negative pole electricity conducting agent; the positive pole adhesive is PVDF (Polyvinylidene Fluoride), and the molecular weight is three hundred thousand and seven hundred thousand; the copper foil and the aluminium foil are subjected to surface treatment firstly before the pole pieces are manufactured; then, the surfaces of the copper foil and the aluminium foil are attached with an electricity conducting film, wherein the thickness of the electricity conducting film is 1 to 5 mu m. According to the high-power density lithium ion battery, the electricity conductivity of the pole pieces is improved by treating the copper f